The main ideological difference between the League and the Empire is the source of holy energy.
The League priests only recognize Tensess as being a true saint, and they claim that all holy energy comes from him. They refuse to recognize that Nezeb and Skrakan are of equal importance.
Because of this dispute, the Holy Land have become the grounds for an ideological war. It's time to put an end to these arguments and find the true source of the Light!
You can start this stage of the World Mystery by speaking with Zosim Nikulin in Eljune (Level 31). Once you are done with your task, speak with Semer Kiya on Coba Plateau to complete it (Level 31).
The power of the Light is being threatened! Wicked cultists have been trying to warp it to their own ends. They have recently been very active in Coba Plateau, a place filled with mysterious artifacts. It is here that a war is taking place, but it's not being fought over the ancient treasures. It's being fought to save every soul in Sarnaut. Which makes it the Empire's responsibility.
You can start this stage by speaking with Vlada Merinova in Asee-Teph at level 35. It leads to Tensess Temple. Speak with Yasker in Nezebgrad to complete it.
The truth is that the power of the Light is not contained in Tensess, Skrakan, or Nezeb. Instead, it originates from the belief that Sarnaut's inhabitants have in it. Perhaps this is for the best.